Objective: to study the reliability of isokinetic test of the trunk muscles, and to analyze the factors which may influence the isokinetic trunk test.

目的研究躯干肌等速测试的信度并初步分析影响测试的有关因素，为进一步深入研究奠定基础。

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Further, the onset latency of the antagonist trunk muscles increased with target distance, but decreased with target load.

并且躯干拮抗肌的起始潜伏期随着目标的距离增加而增加，重量的加重而减少。

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Results. Onset of trunk extensor muscles was significantly delayed in participants with chronic LBP compared with control subjects.

结果：慢性腰背痛患者躯干伸肌在运动初始显著延迟于对照组。

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When they jump and land, athletes usually favor part of their bodies, such as the trunk, thigh muscles, knees or feet.

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